Pilates: Rollover

Lie faceup on the floor or an exercise mat with your arms at your sides, palms down, legs straight. Lift your legs until they're perpendicular to the floor, feet flexed. Keeping your shoulders relaxed and legs straight, brace your core and raise your hips, slowly reaching your legs behind your head as far as you possibly can and pointing your toes behind you. Slowly reverse the movement to return to start. That's one rep.